fontconfig: fc-match

pkg/fontconfig/char_set.zig

@@ -0,0 +1,25 @@
+const std = @import("std");
+const assert = std.debug.assert;
+const c = @import("c.zig");
+
+pub const CharSet = opaque {
+    pub fn create() *CharSet {
+        return @ptrCast(*CharSet, c.FcCharSetCreate());
+    }
+
+    pub fn destroy(self: *CharSet) void {
+        c.FcCharSetDestroy(self.cval());
+    }
+
+    pub inline fn cval(self: *CharSet) *c.struct__FcCharSet {
+        return @ptrCast(
+            *c.struct__FcCharSet,
+            self,
+        );
+    }
+};
+
+test "create" {
+    var fs = CharSet.create();
+    defer fs.destroy();
+}

pkg/fontconfig/config.zig

@@ -1,5 +1,6 @@
 const std = @import("std");
 const c = @import("c.zig");
+const CharSet = @import("char_set.zig").CharSet;
 const FontSet = @import("font_set.zig").FontSet;
 const ObjectSet = @import("object_set.zig").ObjectSet;
 const Pattern = @import("pattern.zig").Pattern;
@@ -9,11 +10,60 @@ pub const Config = opaque {
         c.FcConfigDestroy(@ptrCast(*c.struct__FcConfig, self));
     }
 
-    pub fn list(self: *Config, pat: *Pattern, os: *ObjectSet) *FontSet {
+    pub fn fontList(self: *Config, pat: *Pattern, os: *ObjectSet) *FontSet {
         return @ptrCast(*FontSet, c.FcFontList(self.cval(), pat.cval(), os.cval()));
     }
 
+    pub fn fontSort(
+        self: *Config,
+        pat: *Pattern,
+        trim: bool,
+        charset: ?[*]*CharSet,
+    ) FontSortResult {
+        var result: FontSortResult = undefined;
+        result.fs = @ptrCast(*FontSet, c.FcFontSort(
+            self.cval(),
+            pat.cval(),
+            if (trim) c.FcTrue else c.FcFalse,
+            @ptrCast([*c]?*c.struct__FcCharSet, charset),
+            @ptrCast([*c]c_uint, &result.result),
+        ));
+
+        return result;
+    }
+
+    pub fn fontRenderPrepare(self: *Config, pat: *Pattern, font: *Pattern) *Pattern {
+        return @ptrCast(*Pattern, c.FcFontRenderPrepare(self.cval(), pat.cval(), font.cval()));
+    }
+
+    pub fn substituteWithPat(self: *Config, pat: *Pattern, kind: MatchKind) bool {
+        return c.FcConfigSubstitute(
+            self.cval(),
+            pat.cval(),
+            @enumToInt(kind),
+        ) == c.FcTrue;
+    }
+
     pub inline fn cval(self: *Config) *c.struct__FcConfig {
         return @ptrCast(*c.struct__FcConfig, self);
     }
 };
+
+pub const FontSortResult = struct {
+    result: Result,
+    fs: *FontSet,
+};
+
+pub const Result = enum(c_uint) {
+    match = c.FcResultMatch,
+    no_match = c.FcResultNoMatch,
+    type_mismatch = c.FcResultTypeMismatch,
+    no_id = c.FcResultNoId,
+    out_of_memory = c.FcResultOutOfMemory,
+};
+
+pub const MatchKind = enum(c_uint) {
+    pattern = c.FcMatchPattern,
+    font = c.FcMatchFont,
+    scan = c.FcMatchScan,
+};

pkg/fontconfig/font_set.zig

@@ -12,13 +12,21 @@ pub const FontSet = opaque {
         c.FcFontSetDestroy(self.cval());
     }
 
-    pub fn len(self: *FontSet) u32 {
+    pub fn fonts(self: *FontSet) []*Pattern {
-        return @intCast(u32, self.cval().nfont);
+        const empty: [0]*Pattern = undefined;
+        const s = self.cval();
+        if (s.fonts == null) return ∅
+        const ptr = @ptrCast([*]*Pattern, @alignCast(@alignOf(*Pattern), s.fonts));
+        const len = @intCast(usize, s.nfont);
+        return ptr[0..len];
     }
 
-    pub fn get(self: *FontSet, idx: usize) *Pattern {
+    pub fn add(self: *FontSet, pat: *Pattern) bool {
-        assert(idx < self.len());
+        return c.FcFontSetAdd(self.cval(), pat.cval()) == c.FcTrue;
-        return @ptrCast(*Pattern, self.cval().fonts[idx]);
+    }
+
+    pub fn print(self: *FontSet) void {
+        c.FcFontSetPrint(self.cval());
     }
 
     pub inline fn cval(self: *FontSet) *c.struct__FcFontSet {
@@ -35,5 +43,5 @@ test "create" {
     var fs = FontSet.create();
     defer fs.destroy();
 
-    try testing.expectEqual(@as(u32, 0), fs.len());
+    try testing.expectEqual(@as(usize, 0), fs.fonts().len);
 }

pkg/fontconfig/main.zig

@@ -1,5 +1,6 @@
 pub const c = @import("c.zig");
 pub usingnamespace @import("init.zig");
+pub usingnamespace @import("char_set.zig");
 pub usingnamespace @import("config.zig");
 pub usingnamespace @import("font_set.zig");
 pub usingnamespace @import("object_set.zig");

pkg/fontconfig/pattern.zig

@@ -14,6 +14,10 @@ pub const Pattern = opaque {
         c.FcPatternDestroy(self.cval());
     }
 
+    pub fn defaultSubstitute(self: *Pattern) void {
+        c.FcDefaultSubstitute(self.cval());
+    }
+
     pub fn print(self: *Pattern) void {
         c.FcPatternPrint(self.cval());
     }
@@ -31,4 +35,6 @@ test "create" {
 test "name parse" {
     var pat = Pattern.parse(":monospace");
     defer pat.destroy();
+
+    pat.defaultSubstitute();
 }

pkg/fontconfig/test.zig

@@ -13,10 +13,42 @@ test "fc-list" {
     var os = fontconfig.ObjectSet.create();
     defer os.destroy();
 
-    var fs = cfg.list(pat, os);
+    var fs = cfg.fontList(pat, os);
     defer fs.destroy();
 
     // Note: this is environmental, but in general we expect all our
     // testing environments to have at least one font.
-    try testing.expect(fs.len() > 0);
+    try testing.expect(fs.fonts().len > 0);
+}
+
+test "fc-match" {
+    const testing = std.testing;
+
+    var cfg = fontconfig.initLoadConfigAndFonts();
+    defer cfg.destroy();
+
+    var pat = fontconfig.Pattern.create();
+    errdefer pat.destroy();
+    try testing.expect(cfg.substituteWithPat(pat, .pattern));
+    pat.defaultSubstitute();
+
+    const result = cfg.fontSort(pat, false, null);
+    errdefer result.fs.destroy();
+
+    var fs = fontconfig.FontSet.create();
+    defer fs.destroy();
+    defer for (fs.fonts()) |font| font.destroy();
+
+    {
+        const fonts = result.fs.fonts();
+        try testing.expect(fonts.len > 0);
+        for (fonts) |font| {
+            var pat_prep = cfg.fontRenderPrepare(pat, font);
+            try testing.expect(fs.add(pat_prep));
+        }
+        result.fs.destroy();
+        pat.destroy();
+    }
+
+    {}
 }